Here is the full list of all 34 Ashen achievements.
Defeat the Elder Dark Sissna.
Complete Flokir's journey.
Reunite the Listener and Human hearts.
Wear the Umbral Veil.
Wear each relic once.
Leap into the dark portal.
Unlock all townsfolk outfits.
Defeat the Shadow of the Ashen.
Complete Jokell's journey.
Complete Vorsa's journey.
Untangle Sissna's weave at the Palace of Lathyrus.
Acquire all lanterns.
Complete Eila's journey.
Construct all houses in Vagrant's Rest.
Hunt a roamar.
Unlock all crafting specialities.
Take a ride in Eila's barrel.
Travel the shadow pathways.
Defeat the Listener Matriarch.
Meet Kol the wildman.
Defeat Touma and Souma.
Free the Diasora pup.
Discover the secret of Contemplation.
Defeat the Elder Dark Ukkoto.
Hunt a squork.
Defeat the brute near Vagrant's Rest.
Hunt the corb near Vagrant's Rest.
Claim Vagrant's Rest.
Hunt a Deer.
Hunt a rafet.
Defeat Sissna in the Children of Sissna mode.
Defeat the Elder Dark Riak.
Defeat Riak in the Children of Sissna mode.
Acquire all Kol's armors.